/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineUserCloudInterface.h
Cancel the ongoing upload of the specified file, if it is in progress
void CancelWriteUserFile ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & UserId, const [FString](API\Runtime\Core\Containers\FString) & FileName )